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The Ce3+ doped Li6Gd(BO3)3 (LGBO) crystal is a promising scintillation crystal for thermal neutron detection. This crystal can be grown by Czochralski technique or modified Bridgman method for its melting point at about 848°C. With a lower radial temperature gradient, the LGBO crystal using CeO2 as dopant host (CeO2:LGBO) can only be grown with the diameter less than 15 mm with a smaller shouldering angle. The viscosity of the melt will be decreased and the crystal diameter can be effectively enlarged by using CeF3 as dopant host (CeF3:LGBO) when the crystals are grown with the same growth parameters. By increasing the radial temperature gradient, larger diameter single crystals of CeO2:LGBO with the diameter of 30 mm or 40 mm have been grown with a larger shouldering angle. The excitation and emission peaks will red shift and the X-ray excited luminescence emission intensity will be increased by using CeF3 instead of CeO2 as dopant host.